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vendor/rails/activesupport/lib/active_support/json/decoding.rb

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require 'active_support/core_ext/module/attribute_accessors'

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module ActiveSupport

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  # Look for and parse json strings that look like ISO 8601 times.

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  mattr_accessor :parse_json_times

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  module JSON

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    class << self

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      attr_reader :parse_error

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      delegate :decode, :to => :backend

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      def backend

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        self.backend = "Yaml" unless defined?(@backend)

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        @backend

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      end

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      def backend=(name)

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        if name.is_a?(Module)

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          @backend = name

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        else

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          require "active_support/json/backends/#{name.to_s.downcase}.rb"

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          @backend = ActiveSupport::JSON::Backends::const_get(name)

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        end

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        @parse_error = @backend::ParseError

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      end

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      def with_backend(name)

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        old_backend, self.backend = backend, name

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        yield

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      ensure

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        self.backend = old_backend

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      end

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    end

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  end

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end

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